Mix together melted butter and maple syrup and drizzle onto bottom of ungreased 8-inch round cake pan. Turn pan to distribute. Arrange as many apple slices as you can in bottom of pan. Chop the rest and set them aside.
Mix together flour, spices and leavening and set aside.
Beat the egg whites with a fork until they're foamy and then add brown sugar gradually until it's all mixed. Mix in oil and applesauce. Finally, fold in flour mixture until everything is just mixed together. If you had apples leftover, add them gently now to the batter.
Spoon batter carefully over the bottom-mixture in the pan. Smooth it evenly with the back of a spoon. Bake 25-30 minutes or until it starts to turn golden brown (I let it go a little too long but it was still delicious).
Let the cake cool at least 10 minutes and then carefully turn it out of the pan, loosening the edges with a butter knife and then inverting a dinner plate or platter onto the pan and flipping it (carefully!) over.
It made its own sauce! It's so pretty and homey! And low-fat!